36 lines
1.6 KiB
Bash
Executable File
36 lines
1.6 KiB
Bash
Executable File
#!/usr/bin/env bash
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# M3 gate: nat-to — source NAT of transit traffic to the egress address.
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#
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# Scenario: cli (10.0.1.10) -> srv (10.0.2.20) through pf0, rule:
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# nat on egress proto icmp from 10.0.1.0/24 to any -> (egress)
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# Expected: srv sees src 192.168.122.8 (pf0 egress IP) instead of 10.0.1.10;
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# the reply is de-NATed and delivered back to cli; `pfctl -s nat`,
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# `pfctl -s states` show the translation.
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set -uo pipefail; cd "$(dirname "$0")"; . ./lib.sh
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FAILED=0
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pf0 "insmod /tmp/pf.ko 2>/dev/null || insmod /opt/pf/pf.ko; true"
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pf0 '/opt/pf/pfctl -e; /opt/pf/pfctl -f /dev/null' >/dev/null
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cat > /tmp/g05.conf <<C
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nat on egress proto icmp from 10.0.1.0/24 to any -> (egress)
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pass in quick on ingress proto icmp keep state
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pass out quick proto icmp keep state
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C
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pfload /tmp/g05.conf || { bad "nat rule load"; finish; }
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pf0 '/opt/pf/pfctl -sn' | grep -q 'nat on egress' && ok "nat rule listed" || bad "nat not listed"
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# capture on pf0's egress while cli pings srv
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pf0 'tcpdump -ni egress -c 4 -e icmp > /tmp/nat.td 2>&1 &'
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sleep 1
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cli "ping -c 2 -W 2 $SRV_IP >/dev/null 2>&1" && ok "transit ping through NAT" || bad "transit ping"
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sleep 2
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TD=$(pf0 'cat /tmp/nat.td')
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echo "$TD" | grep -q "$CLI_IP" && bad "cli source address leaked to egress" || ok "source rewritten (no $CLI_IP on egress)"
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echo "$TD" | grep -q '192.168.122.8' && ok "nat applied to $(pf0 'ip -4 addr show egress | grep -o "192[0-9.]*"' | head -1)" || bad "egress src ip not seen"
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pf0 '/opt/pf/pfctl -s states' | grep -q "$SRV_IP" && ok "state present" || bad "no state"
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pf0 '/opt/pf/pfctl -d' >/dev/null
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finish
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